3D Printing Applicator Unit Spacing Mechanism
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Solution Overview
Problem
Existing laser sintering machines for creating three-dimensional objects from powdered materials face issues with layer disruption during the return movement of the trowel, leading to inaccuracies and stress on the platform movement mechanisms, which complicates the sintering process and affects precision.
Innovation Solution
The machine incorporates spacing means that elevate the applicator unit during its return movement, maintaining the powder layer intact and reducing platform movement stresses, allowing precise laser sintering without continuous platform lowering and raising.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the trowel operates in contact with or at a predetermined distance from the working surface to distribute powder, then the powder layer can be properly deposited, but the return movement of the trowel disrupts the deposited powder layer
Solution Approach 1:
The solution introduces a vertical dimension to resolve the horizontal conflict. The applicator unit is elevated vertically during its return movement, changing its position from the working level to a raised position. This dimensional change allows the trowel to return to its initial position without contacting the deposited powder layer, thus preventing disruption while maintaining proper powder distribution during the forward stroke
2Manufacturing precision
If the growing platform is lowered before trowel return to avoid contact, then the powder layer is protected, but continuous platform lowering and raising creates mechanical stress and complicates control
Solution Approach 1:
The solution extracts the conflict-resolution function from the growing platform and transfers it to the applicator unit. Instead of moving the platform vertically to protect the powder layer, the applicator unit itself is elevated during return movement. This separation of functions reduces mechanical stress on the platform mechanisms and simplifies control, as only the applicator unit needs vertical adjustment during return, not the entire platform
3Device complexity
If the applicator unit remains in contact with the working surface during return, then the mechanism is simple, but the deposited powder layer is disrupted and precision is reduced
Solution Approach 1:
The solution makes the applicator unit dynamically adjustable in the vertical direction. The unit can be lowered to contact the working surface during the forward stroke for proper powder distribution, then elevated during the return stroke to avoid disrupting the deposited layer. This dynamic positioning capability resolves the contradiction by allowing the system to adapt its configuration based on the operational phase, maintaining both mechanism simplicity and production precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution maintains the integrity of the powder layer, enhances precision, and reduces mechanical stress on the platform, resulting in improved accuracy and efficiency in producing three-dimensional objects.
Implementation Method 1
a laser focused on the zones covered by the layer of powder, until the granules of powder have fused together
Implementation Method 2
the sintering process consists of transforming powdered material into a solid end product, by means of a thermal treatment carried out by irradiating the powder with a laser beam
Data Source
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AI summary
A machine (1) for making three-dimensional objects from powdered materials comprises a main body (3) forming a working surface (4) and a growing cavity (5) made in the main body (3) and open at the working surface (4). The machine (1) also comprises feeding means (11) for feeding the powdered materials to the working surface (4) and an applicator unit (15) movable along the working surface (4) for bringing the powdered materials from the feeding means (11) to the growing cavity (5). In accordance with this invention, the machine (1) comprises spacing means (23) for spacing the applicator unit (15) which can be activated on it for spacing it from the working surface (4) during a return direction (20) of the applicator unit (15) opposite to a forward direction (19).